US4979602A - Release device for a clutch - Google Patents

Release device for a clutch Download PDF

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Publication number
US4979602A
US4979602A US07/430,385 US43038589A US4979602A US 4979602 A US4979602 A US 4979602A US 43038589 A US43038589 A US 43038589A US 4979602 A US4979602 A US 4979602A
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United States
Prior art keywords
wall portion
cylinder
intermediate wall
piston
cylindrical
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Expired - Lifetime
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US07/430,385
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English (en)
Inventor
Hirotaka Fukushima
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Exedy Corp
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Exedy Corp
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Publication date
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Assigned to KABUSHIKI KAISHA DAIKIN SEISAKUSHO reassignment KABUSHIKI KAISHA DAIKIN SEISAKUSHO ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FUKUSHIMA, HIROTAKA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
    • F16D25/082—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member the line of action of the fluid-actuated members co-inciding with the axis of rotation
    • F16D25/087—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member the line of action of the fluid-actuated members co-inciding with the axis of rotation the clutch being actuated by the fluid-actuated member via a diaphragm spring or an equivalent array of levers

Definitions

  • This invention relates to a device for a friction clutch for use in automobiles or the like, of the type in which a release bearing for controlling engage/release operation of the clutch is hydraulically operated.
  • some type of friction clutch incorporates such an arrangement that a cylinder device for driving a release bearing is disposed adjacent the release bearing in a clutch housing.
  • the cylinder is formed with a cylindrical operation chamber (a hollow) and a cylindrical piston fits in the operation chamber.
  • the piston projects outwardly from one end of the operation chamber, the projecting end of the piston being connected to the release bearing.
  • a seal is provided to seal off the operation chamber, but it is inevitable that operation fluid leaks outward, though in very small amount, from a circumferential surface of the seal. Such leak fluid is likely to scatter about within the clutch housing, so that it deposits on friction facing and other parts. As a result, undesirable slippage may be caused to the friction facing. Another trouble is that any fluid affected part is easily liable to corrosion.
  • the object of the invention is to provide a release device for a clutch which eliminates the foregoing problems.
  • a release device for a clutch comprising a cylinder disposed within a clutch housing in axial alignment relation with a release bearing, said cylinder having a cylindrical intermediate wall portion projecting toward the release bearing, a cylindrical piston having a cylindrical hollow portion open at one end which is connected to the release bearing, said intermediate wall portion being slidably fitted through a main seal into said hollow portion, a part of said hollow portion defining an operation chamber facing a front end of said intermediate wall portion, a hydraulic control mechanism connected to the exterior of the operation chamber, said cylinder further having an inner wall portion and an outer wall portion, both of a cylindrical shape, which is fitted respectively on inner and outer peripheries of the piston, auxiliary seals provided between said inner wall portion and said piston and between said outer wall portion and said piston, and a drain oil passage provided in said cylinder for connecting internal spaces between said inner and intermediate wall portions and between said outer and intermediate wall portions to a discharge site outside the clutch housing.
  • any leakage fluid from the operation chamber flows between the intermediate wall portion of the cylinder and the outer and inner walls of the piston until the fluid reaches the internal spaces of the cylinder, from which it in turn flows into the drain passage for being discharged to a suitable discharge site.
  • FIGURE is a schematic sectional view of one embodiment of the invention.
  • a transmission input shaft 2 projects from a transmission housing 1 into a clutch housing not shown.
  • a release device for a clutch is mounted on an external surface of the housing 1 to surround the input shaft 2.
  • a clutch disk not shown is connected to a front end of the input shaft 2 so that the clutch is connected by pressing a friction facing of the clutch disk by a pressure plate against a flywheel.
  • An annular diaphragm spring 3 is connected to the pressure plate for controlling pressing operation of the flywheel (that is, engage/release operation of the clutch).
  • a release bearing 5 of the release device is connected to the inner periphery of the diaphragm spring 3.
  • the clutch is released by moving the release bearing 5 in the direction of arrow A and is engaged by moving the release bearing 5 in the opposite direction (that is, releasing a force acting in the direction of arrow A).
  • the above arrangement is well known in the art.
  • the release device is equipped, in addition to the release bearing 5, with a cylinder 6 and piston 7.
  • the cylinder 6 is located intermediate between the housing 1 and the release bearing 5 and has, in integral relation therewith, an annular portion 10 extending round the input shaft 2, and an inner wall portion 11, an intermediate wall portion 12, and an outer wall portion 13, which wall portions are of a cylindrical shape and located in concentric relation to the input shaft 2.
  • the annular portion 10 is fixed to the outer surface of the housing 1 by certain means not shown.
  • the wall portions 11, 12, 13 extend respectively from inner wall, radially median, and outer wall portions of the annular portion 10 in a direction away from the housing 1, and between the wall portions are defined spaces 14, 15 having an annular sectional shape which are open toward the release bearing 5.
  • the piston 7 is generally cylindrical and has an hollow portion 20 open toward the housing 1 and extending concentrically with the input shaft 2.
  • the piston 7 has, in integral relation therewith, cylindrical inner and outer wall portions 21, 22, and an end wall portion 23 which continues to the release bearing 5 side ends of the wall portions 21, 22.
  • the piston 7 has a cylindrical wall portion 24 projecting from the end wall portion 23 toward the diaphragm spring 3.
  • An outer race of the release bearing 5 is fixed to the inner periphery of the wall portion 24.
  • a return spring 25 (a compression coil spring) is interposed between a snap ring fixed to the inner periphery of the end wall portion 23 and the front end of the inner wall portion 11.
  • the intermediate wall portion 12 of the cylinder 6 slidably fits in the hollow portion 20 of the piston 7, and the inner and outer wall portions 21, 22 of the piston 7 slidably fit in the spaces 14, 15 of the cylinder 6 respectively.
  • An annular main seal 30 is fixed to the front end of the intermediate wall portion 12, and an operation chamber 31 is defined by the hollow portion 20 between the main seal 30 and the end wall portion 23.
  • the main seal 30 seals the operation chamber 31 relative to a clearance (sliding surface) between the intermediate wall portion 12 and the inner wall portion 21 and to a clearance (sliding surface) between the intermediate wall portion 12 and the outer wall portion 22.
  • control oil passages 32 In the main seal 30 and at one location (or a plurality of circumferentially spaced locations) in the intermediate wall portion 12 there are provided a series of control oil passages 32 extending in the axial direction (or in a direction parallel to the input shaft 2).
  • the control oil passages 32 connect at one end to the operation chamber 31 and at the other end to one end of a generally axially extending oil passage 33 in the annular portion 10.
  • the other end of the oil passage 33 is open at an outer peripheral site of the annular portion 10 and is connected through an external oil passage 34 to a hydraulic control mechanism (not shown) outside the clutch housing.
  • the hydraulic control mechanism controls hydraulic pressure in response to the operation of a clutch pedal.
  • auxiliary seals 35, 36 at respective front ends of the inner wall portion 11 and outer wall portion 13.
  • the auxiliary seals 35, 36 are respectively fixed to notches cut in the front end outer periphery of the inner wall portion 11 and the front end inner periphery of the outer wall portion 13 and are slidably fitted on the inner periphery of the inner wall portion 21 and on the outer periphery of the outer wall portion 22.
  • the inner and outer wall portions 21, 22 extend only midway into above mentioned spaces 14, 15 respectively, so that bottom portions of the spaces 14, 15 (between front ends of the wall portions 21, 22 and the annular portion 10) define comparatively spacious hollows.
  • a drain oil passage 37 is connected at one end to the bottom portions of the spaces 14, 15.
  • the drain oil passage 37 is formed in a lower portion of the annular portion 10 and is connected at the other end through a separate passage (not shown) to a suitable discharge site outside the clutch housing.
  • operation fluid within the operation chamber 31 oozes out, though in very small amounts, to the inner and outer peripheral surfaces of the intermediate wall portion 12 passing across the circumferential surface of the main seal 30, so that the sliding surfaces between the intermediate wall portion 12 and the inner wall portion 21 and between the intermediate wall portion 12 and the outer wall portion 22 are lubricated.
  • Such oozing fluid flows from the sliding surfaces into the spaces 14, 15 and is finally discharged through the drain oil passage to an external discharge site. Therefore, the oozing fluid will never leak into the space surrounding the release device (space within the clutch housing).
  • auxiliary seals 35, 36 Even if the foreign matter clears the auxiliary seal 36, for example, it must, before it can reach the main seal 30, enter the hollow portion of the space 15 passing through the clearance between the outer wall portion 13 and the outer wall portion 22, and travel a further distance from the space 15 along the sliding surfaces of the intermediate wall portion 12 and of the outer wall portion 22 without entering the drain oil passage 37. Actually, no foreign matter could reach the main seal 30 via such bent long passage.
  • oozing fluid from the operation chamber 31 can be discharged into the drain oil passage 37. Therefore, oozing fluid can be effectively prevented from depositing on any part of the clutch and possible slippage of the friction facing and corrosion of parts can be prevented.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Mechanical Operated Clutches (AREA)
US07/430,385 1988-11-09 1989-11-02 Release device for a clutch Expired - Lifetime US4979602A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1988146207U JPH053778Y2 (xx) 1988-11-09 1988-11-09
JP63-146207[U] 1988-11-09

Publications (1)

Publication Number Publication Date
US4979602A true US4979602A (en) 1990-12-25

Family

ID=15402542

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/430,385 Expired - Lifetime US4979602A (en) 1988-11-09 1989-11-02 Release device for a clutch

Country Status (2)

Country Link
US (1) US4979602A (xx)
JP (1) JPH053778Y2 (xx)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2688560A1 (fr) * 1992-03-11 1993-09-17 Skf France Butee d'embrayage a commande hydraulique.
US5458224A (en) * 1992-09-18 1995-10-17 Kabushiki Kaisha Daikin Seisakusho Clutch release-actuating hydraulic cylinder fluid chamber construction
DE19635101A1 (de) * 1995-09-14 1997-03-20 Valeo Ausrücklager mit hydraulischer Betätigung für eine Membranfederkupplung für Kraftfahrzeuge
FR2738884A1 (fr) * 1995-09-19 1997-03-21 Valeo Verin a deux chambres de commande et butee de debrayage munie d'un tel verin
US5810145A (en) * 1995-09-14 1998-09-22 Valeo Hydraulically controlled disengagement device for a clutch, notably for motor vehicles
US6310747B1 (en) 1991-09-25 2001-10-30 Mobile Storage Technology, Inc. Method for reducing external signal interference with signals in a computer disk storage system
CN101885333A (zh) * 2009-05-12 2010-11-17 日产自动车株式会社 驱动力传递装置
US20110220451A1 (en) * 2008-11-25 2011-09-15 Nissan Motor Co., Ltd. Dry clutch
CN102459940A (zh) * 2009-06-15 2012-05-16 博世株式会社 离合器致动器以及具备该离合器致动器的离合器
US20130284557A1 (en) * 2011-03-17 2013-10-31 Aisin Aw Co., Ltd. Vehicle driving force transmission device
DE112005000957B4 (de) 2004-05-22 2015-08-13 Schaeffler Technologies AG & Co. KG Konzentrische Nehmerzylinder

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422155A (en) * 1945-07-04 1947-06-10 Ernest E Wemp Clutch and clutch operating mechanism
US2717680A (en) * 1952-12-17 1955-09-13 Chrysler Corp Clutch
US3687253A (en) * 1970-07-22 1972-08-29 Clark Equipment Co Power assisted clutch
US4456111A (en) * 1980-11-22 1984-06-26 Fichtel & Sachs Ag Hydraulic control system for a clutch
US4518070A (en) * 1981-06-23 1985-05-21 Honda Giken Kogyo Kabushiki Kaisha Clutch release apparatus for change speed transmission
US4561531A (en) * 1981-12-15 1985-12-31 Automotive Products Plc Hydraulic slave cylinder with latch means for use with clutch release bearing
US4585106A (en) * 1982-05-28 1986-04-29 Automotive Products Plc Annular slave cylinder for motor vehicle clutch control mechanism
US4601374A (en) * 1982-04-22 1986-07-22 Federal-Mogul Corporation Hydraulic clutch piston and seal
US4620625A (en) * 1982-04-22 1986-11-04 Federal-Mogul Corporation Fluid actuated clutch assembly

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0643835B2 (ja) * 1985-10-29 1994-06-08 日産自動車株式会社 自動変速機用オイルポンプ
JPH07103896B2 (ja) * 1986-02-13 1995-11-08 光洋精工株式会社 油圧式クラツチレリ−ズ装置

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422155A (en) * 1945-07-04 1947-06-10 Ernest E Wemp Clutch and clutch operating mechanism
US2717680A (en) * 1952-12-17 1955-09-13 Chrysler Corp Clutch
US3687253A (en) * 1970-07-22 1972-08-29 Clark Equipment Co Power assisted clutch
US4456111A (en) * 1980-11-22 1984-06-26 Fichtel & Sachs Ag Hydraulic control system for a clutch
US4518070A (en) * 1981-06-23 1985-05-21 Honda Giken Kogyo Kabushiki Kaisha Clutch release apparatus for change speed transmission
US4650055A (en) * 1981-06-23 1987-03-17 Honda Giken Kogyo Kabushiki Kaisha Clutch release apparatus for change speed transmission
US4561531A (en) * 1981-12-15 1985-12-31 Automotive Products Plc Hydraulic slave cylinder with latch means for use with clutch release bearing
US4601374A (en) * 1982-04-22 1986-07-22 Federal-Mogul Corporation Hydraulic clutch piston and seal
US4620625A (en) * 1982-04-22 1986-11-04 Federal-Mogul Corporation Fluid actuated clutch assembly
US4585106A (en) * 1982-05-28 1986-04-29 Automotive Products Plc Annular slave cylinder for motor vehicle clutch control mechanism

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6310747B1 (en) 1991-09-25 2001-10-30 Mobile Storage Technology, Inc. Method for reducing external signal interference with signals in a computer disk storage system
FR2688560A1 (fr) * 1992-03-11 1993-09-17 Skf France Butee d'embrayage a commande hydraulique.
US5458224A (en) * 1992-09-18 1995-10-17 Kabushiki Kaisha Daikin Seisakusho Clutch release-actuating hydraulic cylinder fluid chamber construction
DE19635101A1 (de) * 1995-09-14 1997-03-20 Valeo Ausrücklager mit hydraulischer Betätigung für eine Membranfederkupplung für Kraftfahrzeuge
DE19635101B4 (de) * 1995-09-14 2006-02-09 Valeo Ausrücklager mit hydraulischer Betätigung für eine Membranfederkupplung für Kraftfahrzeuge
US5743370A (en) * 1995-09-14 1998-04-28 Valeo Hydraulic clutch release bearing for a motor vehicle diaphragm clutch
US5810145A (en) * 1995-09-14 1998-09-22 Valeo Hydraulically controlled disengagement device for a clutch, notably for motor vehicles
US5732811A (en) * 1995-09-19 1998-03-31 Valeo Ram with two control chambers and a clutch release bearing provided with such a ram
FR2738884A1 (fr) * 1995-09-19 1997-03-21 Valeo Verin a deux chambres de commande et butee de debrayage munie d'un tel verin
DE112005000957B4 (de) 2004-05-22 2015-08-13 Schaeffler Technologies AG & Co. KG Konzentrische Nehmerzylinder
DE112005000957C5 (de) * 2004-05-22 2018-08-09 Schaeffler Technologies AG & Co. KG Konzentrische Nehmerzylinder
US20110220451A1 (en) * 2008-11-25 2011-09-15 Nissan Motor Co., Ltd. Dry clutch
US8640844B2 (en) 2008-11-25 2014-02-04 Nissan Motor Co., Ltd. Dry clutch
CN101885333A (zh) * 2009-05-12 2010-11-17 日产自动车株式会社 驱动力传递装置
US20100288597A1 (en) * 2009-05-12 2010-11-18 Nissan Motor Co., Ltd. Drive force transmitting apparatus
US8376112B2 (en) * 2009-05-12 2013-02-19 Nissan Motor Co., Ltd. Drive force transmitting apparatus
CN101885333B (zh) * 2009-05-12 2013-08-14 日产自动车株式会社 驱动力传递装置
CN102459940A (zh) * 2009-06-15 2012-05-16 博世株式会社 离合器致动器以及具备该离合器致动器的离合器
US20130284557A1 (en) * 2011-03-17 2013-10-31 Aisin Aw Co., Ltd. Vehicle driving force transmission device

Also Published As

Publication number Publication date
JPH053778Y2 (xx) 1993-01-29
JPH0267123U (xx) 1990-05-21

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Owner name: KABUSHIKI KAISHA DAIKIN SEISAKUSHO, JAPAN

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Effective date: 19891020

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